NCJ Number
27241
Date Published
1975
Length
58 pages
Annotation
PERFORMANCE REQUIREMENTS AND TESTING METHODS FOR PORTABLE ACTIVE NIGHT VISION EQUIPMENT USED PRIMARILY FOR HANDHELD VISUAL OBSERVATION BY LAW ENFORCEMENT PERSONNEL.
Abstract
IT APPLIES TO DEVICES WHICH EMPLOY SINGLE-STAGE ELECTROSTATICALLY FOCUSED IMAGE INTENSIFIER TUBES HAVING A MAXIMUM EFFECTIVE DIAMETER OF 25MM, A PHOTOCATHODE WITH S-1 SENSITIVITY, AND AN INFRARED LIGHT SOURCE. THIS STANDARD WAS PREPARED BY THE LAW ENFORCEMENT STANDARDS LABORATORY OF THE NATIONAL INSTITUTE OF LAW ENFORCEMENT AND CRIMINAL JUSTICE AND IS INTENDED FOR USE AS AN AID IN THE SELECTION AND PROCUREMENT OF QUALITY EQUIPMENT. IT SPECIFIES MINIMUM REQUIREMENTS AND METHODS OF TEST FOR PERFORMANCE PARAMETERS SUCH AS: OPTICAL GAIN, OPTICAL GAIN STABILITY, LIGHT EQUIVALENT BACKGROUND, LIGHT INDUCED BACKGROUND, LUMINANCE OF OUTPUT SCREEN, LUMINANCE UNIFORMITY, CATHODE AND SCREEN QUALITY, DISTORTION, CONTRAST TRANSFER FUNCTION, FLARE, SEARCHLIGHT ALIGNMENT AND BEAM SPREAD, EFFECTIVE RANGE, TRANSMISSION OF INFRARED FILTER, TEMPERATURE AND HUMIDITY, AND EYEPIECE RADIATION, FOCUS ADJUSTMENT, CURVATURE OF FIELD AND DISTORTION. APPENDIXES PROVIDE DESCRIPTIONS OF TEST EQUIPMENT THAT ARE ACCEPTABLE FOR USE IN CONDUCTING CERTAIN TESTS. (SNI ABSTRACT)